In what do mutations occur?

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(B) Mutations are sudden,heritable changes in the genetic material $(DNA)$ of an organism. Mutations can occur in any gene,whether it is dominant,rece

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Recessive genes

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(B) Mutations are sudden,heritable changes in the genetic material $(DNA)$ of an organism. Mutations can occur in any gene,whether it is dominant,recessive,or lethal. However,in population genetics,recessive mutations are often more significant because they can accumulate in the gene pool without being expressed in the phenotype of heterozygotes. Therefore,mutations occur in all types of genes.

Column-$I$	Column-$II$
$(1)$ Lethal mutation	$(a)$ Mutation caused by external factors
$(2)$ Spontaneous mutation	$(b)$ They are metabolic errors
$(3)$ Induced mutation	$(c)$ As a result the mutant dies
$(4)$ Biochemical mutation	$(d)$ Most of the mutations occurring in nature are of this type

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